# quick algebra questions

• Find a local building and estimate its height. How tall do you think the building is?
• The smallest building in town is about 50 ft. high.
• Use the Internet to find some initial velocities for different types of fireworks. What are some of the initial velocities that you found
• Some have a Vi of 39.2 m/s, 152 m/s, etc.

1. While setting up a fireworks display, you have a tool at the top of the

building and need to drop it to a coworker below.

• How long will it take the tool to fall to the ground? (Hint: use the first

equation that you were given above, h(tâˆ’) = 1+6t2 h0 . For the buildingâ€™s

height, use the height of the building that you estimated in Task 1.)

h = 50 feet

-50= -16t^2 â€“ 0

t=1.767767

• Draw a graph that represents the path of this tool falling to the

ground. Be sure to label your axes with a title and a scale. Your graph should show the height of the tool, h, after t seconds have passed. Label this line â€œToolâ€.

1. State whether the parabola represented by h(tâˆ’) = 1+6t2 250t opens up or

down. Explain why your answer makes sense in the context of this problem.

2. One of the fireworks is launched from the top of the building with an initial

upward velocity of 150 ft/sec.

-What is the equation for this situation?

-When will the firework land if it does not explode?

-Make a table for this situation so that it shows the height from time

t = 0 until it hits the ground.

-Calculate the axis of symmetry.

-Calculate the coordinates of the vertex.

-Explain why negative values for t and h(t) do not make sense for this

problem.

-On the same coordinate plane from #1, draw a graph that represents

the path of this firework. Make sure that your graph is labeled

appropriately. Label this graph â€œFirework #1â€.

-Choose an initial velocity for a firework based on your research from Task 1

• Write an equation that represents the path of a firework that is launched from the ground with the initial velocity that you chose.
• Suppose this firework is set to explode 3 seconds after it is launched. At what height will this firework be when it explodes?
• On the same coordinate plane that you have been using, draw a graph that represents the path of this firework. Mark your graph to indicate the point at which the firework will explode. Label this graph â€œFirework #2â€.
3. You launch a third firework. Decide whether you want to launch it from the ground or from the roof of the building. Also, choose a height at which this firework will explode and an initial velocity for this firework.
• How long after setting off the firework should the delay be set?
• On the same coordinate plane that you have been using, draw a graph

that represents the path of this firework. Mark your graph to indicate the point at which the firework will explode. Label this graph â€œFirework #3â€.

4. What can you conclude about how the height of the building and the initial velocity of the item launched affect the maximum height and the time it takes to get there?

You will submit the following items.

â€¢ results of your research, including the height of the building that you found and initial velocities for fireworks

a graph that shows the paths of the tool that was dropped and the three fireworks that were launched

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